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   this work for additional information regarding copyright ownership.
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   (the "License"); you may not use this file except in compliance with
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package org.apache.poi.ss.formula;

Should be implemented by any Ptg subclass that needs has an extern sheet index 

For POI internal use only
Author:
Josh Micich/**
 * Should be implemented by any {@link org.apache.poi.ss.formula.ptg.Ptg} subclass that needs has an extern sheet index <br>
 *
 * For POI internal use only
 *
 * @author Josh Micich
 */
public interface ExternSheetReferenceToken {
	int getExternSheetIndex();
	
Returns:
formula text for this reference token without the qualifying sheet name/**
	 * @return formula text for this reference token without the qualifying sheet name
	 */
	String format2DRefAsString();
}